2,4

Three results are missing for a(7) in Eric Weisstein's World of Mathematics: [2, 3, 7, 43, 3263, 4051, 2558951] [2, 3, 11, 25, 29, 1097, 2753] [2, 3, 13, 25, 29, 67, 2981]. - Zhao Hui Du, Jan 24 2010

Table of n, a(n) for n=2..8.

Zhao Hui Du, all results for a(8) [Broken link]

Eric Weisstein's World of Mathematics, Znam's Problem

Cf. A075461.

Sequence in context: A123310 A058119 A335547 * A187008 A333837 A075634

Adjacent sequences: A075438 A075439 A075440 * A075442 A075443 A075444

nonn,more,hard

Eric W. Weisstein, Sep 16 2002

a(7)-a(8) corrected by Zhao Hui Du, Jan 24 2010

approved